Method of making latch pivots



' HARRY w.

Patented Oct. 11, 1932 KRANZ, OF LAKE'WOOD, OHIO, ASSIGNOR TO THE CLEVELAND WELDING COMPANY, OF CLEVELAND, OHIO, A CORPORATION OF OHIO METHOD OF MAKING LATCH PIVOTS Application filed November 4, 1929. Serial No. 404,539.

This invention, as indicated, relates to latch pivots and methods of making the same and has specific reference to the latch pivots by which the collapsible latch forming the V .5 subject matter of co-pending application Serial No. 214,878, filed Aug. 23, 192?, is pivotally attached to a transversely split rim for supporting the common type of pneumatic tire.

It is an object of this invention to provide a latch pivot member or clevis which shall a have novel features of construction desirable from the standpoint of practicability as well as low cost of manufacture. A further object of this invention is to provide a method of forming such latch pivots or clevises, and more particularly the steps in such a method of providing such latch pivots with the necessary bearing surface for 20 engaging the inner periphery of demountable rims and also rivet projecting members for engaging laterally disposed openings in such rims whereby said latch pivots or clevises and the latches which they secure can be sea curely fastened to the inner surfaces of such demountable rims.

To the accomplishment of the foregoing and related ends, said invention, then, consists of the means and steps hereinafter fully described and particularly pointed out in the claims; the annexed drawing and the fol lowing description setting forth in detail certain means and one mode of carrying out the invention, such disclosed means and mode illustrating, however, but one of various ways in which the principle of the invention may 7 be used.

In said annexed drawing: Fig. 1 is a fragmentary front elevation of a demountable rim with latch member attached thereto by means of a latch pivot membe Fig. 2 is a diagrammatic view of the portion of round stock used in forming such latch pivot members; Figs. 3, 4, 5 and 6 show the latch pivot member at various stages in theforming process; Figs. 7, 8 and 9 are side views of Figs. 4, 5 and 6, respectively;

and Fig. 10 is a fragmentary part section,

part elevation, of the latch secured to the base of a rim by means of the latch pivot member.

Referring more specifically to the drawing and more especially to Fig. 1, the arrangement here shown consists of a demountable tire-supporting rim 1 which is transversely split at 2 and to the inner periphery of.

which is pivotally supported the latch body 3 by means of the clevis member 4 and the projection 5, which projection is engaged by the bifurcated end 6 of the latch member 3 and pivo gtally secured thereto by means of the pin a The portion of round stock 8, shown in Fig. 2, is the stock from which the latch clevis isformed and may be either pre-formed to proper length or so formed as a part of this method. The bar 8 of Fig. 2 is then inserted in the a erture 9 formed therefor transversely of tie latch body 3, which is shown in dotted outline in Fig. 3. The medial portion 10 of such bar is of such diameter that the clevis can freely rotate in the aperture 9.

After the bar 8 has been inserted in the aperture 9, as just explained, it is then heated either electrically or otherwise, or such heating may be carried on before the bar 8 is inserted into the latch 3, but regardless of how such heating is carried on or the time at which such heating is accomplished, after the bar 8 has been inserted into the aperture 9 of the latch body 3, its terminal portions 11 are then struck by a die or otherwise suitably acted upon to form the contour thereof to correspond substantially to theoutline as illustrated in Figs. 4 and 7. After the terminal portions 11 of the bar 8 have been flattend, as described, such terminal portions are then bent downwardly to produce the downwardly extending portions 12, shown in Figs. 5 and 8.

It will be seen that the terminal portions of the bar 8, as acted upon, will have'their lower surfaces 13 substantially flattened, as shown in Fig. 7 and by the dotted line in Fig. 8. This flattening of the lower surface 13 of the bar 8 will preferably be accomplished simultaneously with the flattening of the terminal portions 11, as heretofore ex- ,plained. Afterthe flattened terminal portions 11 have been bent downwardly into the downwardly extending ends 12, such downwardly'extending ends 12 are then formed into substantially rectangular rivet portions 14; having the base or shoulder portion 13,

" as shown inFigs.v 6 and 9.. The length of the rivet portions 14 which extendbelow the previously described flattened portions 13oftheclevis, is suflicient to extend through V apertures 15 formed therefor in thebase of. the rim 1 and provide'suificient metal for upsetting the projecting ends of the rivet. mem-- extend into a slot 17 formed therefor in the base of the rim 1 and the thickness of such metal will be. the amount equivalent to. the

thickness of the base of such rim, sothat the outercircumferential surface of such base i will present a smooth face to receive the tire mounted on the rim."

It will be seen from the meth'o' d' outlined 'th'atithe latch clevis can be formed: in a manner which is particularly applicable to mass production as well as forming a 'clevis 'member having'the desired structural fea- "tures; The manner in which the cl'evi's is secured to the base of the rim affords a connection which is superior from the standpoint of rigidity as well as the ease and sirnriveted t6 said bar, bending said flattened ends, forming a shoulder and tenon on said bent ends, and inserting said sheared ends into and through openings formed inthe base of a demountable rim and upsetting the end of such sheared'portions.

'3. In a; method of forming-latch pivot members for riins, the'steps of" cutting on a portion of cylindricalstock of the desired length, inserting said portion of'stock bar into]; an opening H in. the latch, flattening the projecting ends of said portion, bending said ,fiattened ends atright angles to'the aXis of the central cylinitlrical portion of said bar,

and; forming a; shoulder and tenon on said bent ends. 7 I d I 4. In a method of forming latch pivot neinbers, the steps of cuttingfoif a' portion of cylindrical stock bar'to the desired length, inserting such cylindrical bar into an opening in the latch, heating said bar, bending the projecting portions into a plane at right angles with th-eaxis of the central cylindrical portion andforming a shoulderandtenon on said bent ends.

5. In a method of forming: latch pivot mei'nlz-er's for rims, the steps of cutting ofi'a POItlOIlOf cylindrical stockto the desired length,'inserting such cylindrical stock bar into an opening in theilatch, heating said bar, flattening the projecting ends of said bar, bending said flattened, ends atright angles to the axis ofthe central cylindrical portion,"and forming a shoulder, andtenon on said bent ends.

Signed. by me this 1st day of November,

. HARRY W. KRANZ.

"pli'city with which such connection is made from any method in present use;

.Other modes of applying the principle of my invention may be employed instead of the one explained, change being made as regards the method herein disolosedfprovided the stepor steps stated by any of thefo llowing' or steps be employed; 7

I therefore particularly point outand, dis- 1 tinctly claim as my invention 1'. In a method of forming latch pivot members, the steps of inserting a previously cut-off portion of cylindrical stock into an opening in the latch, flattening the projectingportions of said stock, bending said fiattened portions, and forming a shoulder and 'tenon onsaid bent ends V 2.. n a method of forminglatch pivot members for rims, the steps ojf-inserting a "previously G t-0E portion of round stock bar into aniopening. in the latch, heating said claims or the equivalent of such stated step M p rt en, flat e ng. he' p; 0jeT0ting; ends; of 

